Aerodynamic model based on similarity numbers and computational fluid dynamics for coolant mixing in HTGR bottom plenum

This work is devoted to the analysis of an experimental approach to modeling the processes of non-isothermal helium jet mixing at the outlet of the prismatic fuel assemblies and entering the bottom plenum of the high temperature gas cooled reactor core. A review of relevant literature and an analysis of similarity numbers characterizing the investigated process were performed. Based on an integrated approach, the characteristics of the experimental model and the operating parameters of the aerodynamic test facility assembled at the NSTU were selected. Computational studies of the three-dimensional coolant flow in a full-scale reactor fragment under normal operating conditions and in an aerodynamic model have validated the design of the experimental model and confirmed the operating parameters of the test facility.